Distal convoluted tubule (second convoluted tubule or dct) is the part of a nephron that leads from the thick ascending limb of the loop of Henle and drains into a collecting duct. The main function of the distal tubule is to absorb sodium chloride and other inorganic salts while retaining water.

Proximal convoluted tubule (first convoluted tubule or pct) is the section of a nephron situated between Bowman's capsule and the loop of Henle in the vertebrate kidney.